Device for sharpening dental sticks, &amp;c.



J. W. IVORY.

DEVICE FOR SHARPENING DENTAL STICKS, &c. APPLICATION mum JUNE 10,1913.

1,121,252, Patented Dec. 15.1914.

WITNESSES %%W M c? 0157M rHE NORRIS PETERS so F'HO70LIYHO. NAS l/NLIONI) c JAMES W. IVORY, OF PHILADELPHIA,PENNSYLVANIA DEVICE FOR SHARPENINGDENTAL STICKS, 8w.

Specification of Letters Patent.

Patented Dec. 15, 1914-.

Application filed June 10, 1913. Serial No. 772,771.

To all 107mmz't may con cern Be it known that I, James \V. hour, asubject of the King ofrGreat Britain, re-l sidingin the city andcountyof Philadelphia, State of Pennsylvania, have invented a new anduseful Device for Sharpening Dental Sticks, &c., of which the followingis a specification.

My invention consists of a device adapted to sharpen or point a dentalstick, a lead pencil, or other object in a convenient and easy manner,the same embodying a stock into which the object may be inserted, ablade or cutter thereon, and a pressure device adapted. to properlyretain said object resiliently against said blade or cutter, and toassist in guiding said object in its motion into and out of said stock.

It consists also of means for adjusting the angle of the blade orcutter, and other de* tails as will be hereinafter described.

The invention is satisfactorily illustrated in the accompanying drawing,but the important instrumentalities thereof may be varied, and so it isto be understood that the invention is not limited to the specificarrangement and organization shown and described.

Figure 1 represents a perspective view of a device for sharpening orpointing a dental stick, lead pencil, etc, embodying my invention. Fig.2 represents a partial longitudinal section and partial side. elevationthereof. Figs. 3, 4, and 5 represent partial longitudinal sections andpartial side elevations of other embodiments thereof.

Similar numerals of reference indicate corresponding parts in thefigures.

Referring to the drawings :1 designates a tubular stock to one end ofwhich is secured the handle 2 for convenience of operation of thedevice. In the wall of said stock in the end portion opposite to saidhandle is the throat 3, the upper wall of which is sharpened forming theblade or cutter 4 which projects in the direction toward said throat.

To the stock at the rear end of said throat is secured the plate 5 whichforms a wear plate and provides a gage forrsetting the pencil, stick, orother object to be sharpened properly in the stock 1 preparatory to thecutting operation therein.

Below the blade or cutter 4 is the pressure bar 6, which is acontinuation of or ft-he stock, as at .8. albar is sufficiently long andwide to allow connected with the resilient elbow 7, whose lower l1mb issecured to the underside of The upperface of said the pencil or stick torest therein during its sliding motions and to be guided while beingsubjected to the cutting or sharpening action.

The inlet end of the stock 1 is of the form of a conical head 9 whichprimarily receives the portion of the pencil or stick to be sharpenedand the underside of saidhead 1s cut away so as to receive the adjacentportion of the elbow 7 and allow it to play therein and yield topressure.

It will be seen that when the stick or pencil or other object isinserted in the head 9 the portion within the same rides upon the bar 6and depresses the same so as to exert anupward pressure on said portionand hold it resiliently against the blade 4. The end of the object thenreaches the plate 5 and abuts therewith as a stop and gage, see Fig. 2.The object is then drawn out, v m the present case to the right, andsomewhat lowered, when it is forcibly presented to the blade and at anangle thereto, said blade then removing a corresponding part of the woodof the object. Thenthe object is turned and reinserted into the head,when: j it is drawn out again, and so another portion of the wood isout. Then the work continues, until the object is sharpened or pointedto the required extent.

In Figs. 3, 4, and 5, the stock has on its; under side below the upperlimb of the elbow 7, the forwardly projecting tongue 10 which serves asan abutment to limit the descent of said limb when depressed by thepencil or stick superimposed thereon.

In Fig. l, the blade or cutter l: is made separate from the head 9 andsecured thereto by the screw 11, while in Fig. 5, the blade or cutterlikewise is made separate from the head 9, and is pivotally connectedwith the latter as at 12 and provided with a set screw 13 whose pointrests upon said head whereby by the proper rotation of saidscrew theangle of the cutter or blade may be varied according to requirements.

It will be seen also that the portion of the stock between the same andthe head 9 comprises necks 14 which carry the head 9, and the latter isflaring or conical, the widest end being in front whereby the stick 110or object tov be sharpened or cut may be easilyinserted thereto and'be'presented to" 7 of a longitudinally-extending slot 15 thus serving toadd greater resiliency to the elbow 7 and'consequently to the pressurebar 6 and the tongue 10. a

The cutting edge 4 of the head 9 is at the forward end of the throat 3whereby it presents itself conveniently to the pencil or stick, andis'also convenientof access for sharpening purposes. v

It is apparent that as'the portion 2 of-the stock is grasped as ahandle, the device may be firmly held and controlled, while the stick,pencil, or vother object is being manipulated in the head 9, during thecutting,

sharpening, or pointing'of the same.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent, is

1. In a sharpening or pointing device of the character stated, alongitudinally slitted stock, a cutting edge thereon, and a pressure baradjacent to said edge, and comprising a forwardly extending portion, areturn bend, and a rearwardly'extending portion above saidforwardlyextending portion and below the throat of the stock;

2. Ina sharpening or pointing device of the character stated,-alongitudinally slitted stock, a cutting edge thereon, and a resilientpressure barextending forwardly from beneath the throat of said stock tobeyond the cutting edge and then back to be depressed by the article tobe sharpened, the free edge Copies of this patent.- may be obtained forinto which said cutting silientpressure bar supported on the under thecharacter stated, a" tubular stock, a semitubular head, a cutting edgeon the inner end of said head, said stock having a throat edge projects,a reside of the stock and extending angularly within the throat forsupporting the article 'to be sharpened with the latter in alinementwith said stock, and a forwardly projecting member serving as anabutmentto hunt the depressiblemovement of sa d pressure bar.

4c. Ina sharpening or, pointingdevice of the character stated, a tubularstock, a cutting edge thereon, a pressure bar adjacent to the latter, aresilient elbowsof which said pressure bar forms a continuation, saidstock being longitudinally slitted and hav- H ing a throat and the freeend of thepressure bar extending angularly into said throat and beneathsaid cutting edge whereby said free end will limit the depression ofthearticle to be sharpened.

5. In a sharpening or pointing device of the character stated, a stockhaving a semitubular head and a cutting edge thereon and a throat intowhich said edge projects angularly, resilient necks wintermediate ofsaid 1 head and stock and carrying said head and an elbow terminating ina pressurebar said elbow being carried by said stock andtsaid pressurebar 1 projecting into the throat beneath the cutting edge at -anan gleto said q angular cutting edge. d I v I I JAMES w. IVORY.

Vitnesses: A i I JOHN A. WmDERsHErM, I N. BUssrNGER,

Washington, I). G.

